/*
 * Copyright 2023 OPS4J.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.keycloak.adapters.osgi;

import org.keycloak.adapters.KeycloakConfigResolver;
import org.keycloak.adapters.KeycloakDeployment;
import org.keycloak.adapters.KeycloakDeploymentBuilder;
import org.keycloak.adapters.spi.HttpFacade;
import org.osgi.framework.BundleContext;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

/**
 * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
 */
public class BundleBasedKeycloakConfigResolver implements KeycloakConfigResolver {


	private volatile KeycloakDeployment cachedDeployment;

	private BundleContext bundleContext;
	private String configLocation = "WEB-INF/keycloak.json";

	public BundleContext getBundleContext() {
		return bundleContext;
	}

	public void setBundleContext(BundleContext bundleContext) {
		this.bundleContext = bundleContext;
	}

	public String getConfigLocation() {
		return configLocation;
	}

	public void setConfigLocation(String configLocation) {
		this.configLocation = configLocation;
	}

	@Override
	public KeycloakDeployment resolve(HttpFacade.Request request) {
		if (cachedDeployment != null) {
			return cachedDeployment;
		} else {
			cachedDeployment = findDeployment(request);
			return cachedDeployment;
		}
	}

	protected KeycloakDeployment findDeployment(HttpFacade.Request request) {
		if (bundleContext == null) {
			throw new IllegalStateException("bundleContext must be set for BundleBasedKeycloakConfigResolver!");
		}

		URL url = bundleContext.getBundle().getResource(configLocation);
		if (url == null) {
			throw new IllegalStateException("Failed to find the file " + configLocation + " on classpath.");
		}

		try {
			InputStream is = url.openStream();
			return KeycloakDeploymentBuilder.build(is);
		} catch (IOException ioe) {
			throw new IllegalStateException("Error reading file' " + configLocation + "' from bundle classpath.", ioe);
		}
	}

}
